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參數(shù)資料
| 型號(hào)： | UCC2819PW |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | PROGRAMMABLE OUTPUT POWER FACTOR PREREGULATOR |
| 中文描述： | 可編程輸出功率因數(shù)前置穩(wěn)壓器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 156K |
| 代理商： | UCC2819PW |
SLUS482B - APRIL 2001 REVISED DECEMBER 2004
6
www.ti.com
pin descriptions (continued)
VAI:
(voltage amplifier non-inverting input) This input can be tied to the VREF or any other voltage reference
(
≤
7.5 V) to set the boost regulator output voltage.
VAOUT:
(voltage amplifier output) This is the output of the operational amplifier that regulates output voltage.
The voltage amplifier output is internally limited to approximately 5.5 V to prevent overshoot.
VCC:
(positive supply voltage) Connect to a stable source of at least 20 mA between 10 V and 17 V for normal
operation. Bypass VCC directly to GND to absorb supply current spikes required to charge external MOSFET
gate capacitances. To prevent inadequate gate drive signals, the output devices are inhibited unless V
VCC
exceeds the upper under-voltage lockout voltage threshold and remains above the lower threshold.
VFF:
(feed-forward voltage) The RMS voltage signal generated at this pin by mirroring 1/2 of the I
IAC
into a single
pole external filter. At low line, the VFF roll should be 14 V.
VSENSE:
(voltage amplifier inverting input) This is normally connected to a compensation network and to the
boost converter output through a divider network.
VREF:
(voltage reference output) VREF is the output of an accurate 7.5-V voltage reference. This output is
capable of delivering 20 mA to peripheral circuitry and is internally short-circuit current limited. VREF is disabled
and remains at 0 V when V
VCC
is below the UVLO threshold. Bypass VREF to GND with a 0.1-
μ
F or larger
ceramic capacitor for best stability. Please refer to Figures 8 and 9 for VREF line and load regulation
characteristics.
APPLICATION INFORMATION
The UCC3819 is based on the UCC3818 PFC preregulator. For a more detailed application information for this
part, please refer to the UCC3818 datasheet product folder.
The main difference between the UCC3818 and the UCC3819 is that the non-inverting input of the voltage error
amplifier is made available to the user through an external pin (VAI) in the UCC3819. The SS pin and function
were eliminated to accommodate this change.
The benefit of VAI pin is that it can be used to dynamically change the PFC output voltage based on the line
voltage (RMS) level or other conditions. Figure 1 shows one suggested implementation of the tracking boost
PFC converter as this approach is sometimes referred to. The VAI pin is tied to the VFF pin and hence output
voltage scales up with the line voltage. The benefit of this approach is that at lower line voltages the output
voltage is lower and that leads to smaller boost inductor value, lower MOSFET conduction losses and reduced
component stresses. In order for this feature to work, the downstream converter has to operate over a wider
input range.
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| UCC2819PWG4 | 功能描述:功率因數(shù)校正 IC BiCMOS Power Factor Preregulator RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819PWTR | 功能描述:功率因數(shù)校正 IC BiCMOS Power Factor Preregulator RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC2819PWTRG4 | 功能描述:功率因數(shù)校正 IC BiCMOS Power Factor Preregulator RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| UCC281-ADJ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low Dropout 1 Ampere Linear Regulator Family |
| UCC281DP-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
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